Small 3D code
I am looking for a small 3D CFD code, with a kepsilon, or LaunderReeceRodi model builtin. The geometry I use is quite simple (rectangular channel).
One candidate would be the 3D code from Peric, but with turbulence model integrated (it is originally laminar), or his original 2D code with turbulence extended to 3D. The TEACH code could be interesting too. The nicest would we the code compatible with the Malalasekera book :)). I need this code to learn a little bit more about CFD. I have my own 1D code that I use to compute twophase flow in a channel (I wrote the Lagrangian part). With it I can compute only the flow around the channel centerline. Now it would be interesting for me to compute the whole channel, but I do not want to lose too much time grasping a million lines long code. Thanks in advance. 
Re: Small 3D code
If you get it, can you give me a copy it.I am the same as you

K and Omega equation instability
I am developing a 3d code with SST turbulence model (incompressible,unsteady) which is built based on OPENFVM. My problem is that my k and omega equations are giving convergence for the first time step but diverges in the next iteration onwards (segregated approach).
Is it because of lack of proper updation procedure or if some modification in the linear equation especially in the source term is necessary for the implementation of wall boundary condition I rechecked my k and omega equation several times but not giving My problem is flow past a sphere I dont know whether my question is correct but please help 
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